Tennis star Venus Williams hired Taco Boy for her housewarming in Los Angeles. Adrian Grenier and his fellow "Entourage" stars were served on the set by Baby's Badass Burgers.

Food trucks, once derisively called roach coaches, are now a hot culinary item. These mobile food servers have celebrity clients, as well as a cult following that includes thousands of fans on Twitter and Facebook.

Web sites such as track food trucks from Los Angeles to Washington, D.C. The modern chuck wagons are the stars of "The Great Food Truck Race," a Food Network reality show hosted by celebrity chef Tyler Florence, who plans to get his own food truck rolling later this year.

Washington trucks hawk Indian, Korean, Mexican and Fusion fare, not to mention gourmet pizza, sandwiches and sweets. There are about 20 food trucks in the nation's capital, and four more are slated to hit the streets by the end of the year.

To find their hangouts, I searched, which bills itself as "a real-time automated D.C. food truck tracker." During three weeks of tastings, I sampled food from five trucks in various parts of the city.

I started with Red Hook Lobster Truck, which was parked a few blocks away from my office. By 11 a.m. there were already about 30 people waiting in line. During the 20 minutes I waited for my lobster lunch fix, the crowd swelled to more than 100.

Red Hook sells lobster rolls, shrimp rolls and whoopie pies. My friend and I each bought a lobster roll ($15), which was served in a chewy, butter-drizzled bun.

Co-owner Leland Morris said the trucks are currently selling 250 pounds of lobster and 40 pounds of shrimp per week. There are plans to roll out a second truck next year.

My next stop was the bright pink Sweetbites truck, which serves cupcakes, muffins, scones and cookie bars that cost between $2 and $3. The company was started by Sandra Panetta in May after she retired as a biochemist for the Environmental Protection Agency. She invested $200,000 to build a commercial kitchen and customize her truck.

By the time I got there late on a Friday afternoon, only a handful of cupcakes were left. I ordered a chocolate coconut, a bittersweet chocolate ganache and a heavenly pina colada treat that included nuggets of pineapple and coconut topped with a citrus frosting.

Curbside Cupcakes, run by lawyer Sam Whitfield III and his fiancee Kristi Cunningham, sells light fluffy cupcakes ($3) with so much frosting that it sticks to the inside of the carry-out bag. The classic vanilla fell apart when I tried to cut it, but the carrot cake was delicious, full of walnuts and carrot slivers perfectly accented by the cream-cheese frosting.

Sauca serves flatbread sandwiches ($7.50) stuffed with your choice of chicken, sausage, fish, pork, beef and vegetables. The Mexican-style fish mixed with beans and pickled slaw was tasty, though the fish was slightly overcooked.

Since they were out of side dishes, I decided to try Eat Wonky, which specializes in poutine ($5.50), an artery-clogging Canadian dish of french fries topped with cheese curd and gravy. Eat Wonky also serves hot dogs and grilled-cheese sandwiches.

If you're in the mood for affordable Indian food, Fojol Bros. serves plenty of delicious dishes for under $10. The brainchild of former Obama campaign workers Justin Vitarello and Peter Korbel, the truck offers $3 dishes such as buttered chicken with chick peas and eggplant, served over basmati rice.

The portions were huge and the sauces are seasoned to have a slight kick without making you sweat like you're in a sauna.